Table 1.
Observed and derived properties of LAP1.
| Source | Parameter | Value | |
|---|---|---|---|
| LAP1 | Hα | 69.4 ± 5.5 | 10−20 cgs |
| [O III]λ5007 | 14.5 ± 3.4 | 10−20 cgs | |
| [O III]λ4959 | 9.8 ± 3.2 | 10−20 cgs | |
| ( † ) [O III]λ4959⋆ | 4.9 | 10−20 cgs | |
| Hβ | 26.3 ± 2.7 | 10−20 cgs | |
| Hγ | 12.8 ± 2.4 | 10−20 cgs | |
| [O II]λ3727, 3729 | < 3.0 | 10−20 cgs | |
| ( ‡ ) He IIλ1640 | 79.6 ± 20.7 | 10−20 cgs | |
| Lyα | 369.2 ± 29.3 | 10−20 cgs | |
| EW0(Lyα) | > 370 | Å, 3σ, rest | |
| EW0(Hα) | > 2020 | Å, 3σ, rest | |
| EW0(Hβ) | > 420 | Å, 3σ, rest | |
| EW0([O III]λ5007) | > 246 | Å, 3σ, rest | |
| Hα/Hβ |
 |
− | |
| Hβ/Hγ |
 |
− | |
| [O III]λ5007/Hβ |
 |
− | |
| Lyα/Hα |
 |
− | |
| R23 |
 |
− | |
| R3 |
 |
− | |
| O32 | > 3(6) | 2(1)σ | |
| mUV [2000 Å] | > 30.4 | 2σ | |
| mopt [4000 Å] | > 30.4 | 2σ | |
| Z | < 0.004 | Z⊙ | |
| 12 + log(O/H) | < 6.3 | O32 > 6 | |
| log(ξion) | > 26 | [erg Hz−1], 2σ | |
| μtot |
 |
Median | |
| μtang |
 |
Median | |
| A | μtot | > 500 | A1,2 |
| B | μtot | 98,99 | B1,B2 |
| B1+B2 | R3 | < 0.2 | Hα-based |
| B1+B2 | R23 | < 0.4 | Hα-based |
| B1,2 | mUV[2000 Å] | > 32.4 | (B1 or B2), 2σ |
Notes. The reported errors are at 1σ confidence level, unless otherwise specified. The observed Lyα line is likely attenuated by the IGM. The values indicated with units cgs refer to fluxes with units erg s−1 cm−2. ( † )This is the flux of [O III]λ4959 inferred from the observed [O III]λ5007 by adopting the intrinsic flux ratio ([O III]λ5007/[O III]λ4959) = 2.98 (Storey & Zeippen 2000), and used to derive the O32 and R23 indexes described in the text. ( ‡ )The derived flux is very tentative (see text for details). In the main text, we consider the 1σ upper limit of the He IIλ1640 line flux as indicated in the “Value” column (1σ, 20.7 × 10−20 cgs). The intrinsic fluxes and magnitudes can be derived by dividing the reported observed values by μtot. The coordinates of LAP1 are RA = 64.0457716, Dec = −24.0601283.
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